i'm going to sample some lawn areas today and am wondering to what depth the cores should be? also recomendations for the following items N, P, K, PH, OGM, ALSO WHAT MICRO SHOULD BE CHECKED FOR BEST RESULTS. zinc, sulfur, etc?
Soil samples for lawns should be about 4-5 inches deep. You should also check for electrical conductivity (EC) to evaluate the salt content. The micronutrients include zinc, iron, manganese and copper. It's a good idea to check for sulfur. It may be okay, but sometimes it can be quite low. The routine test at the CSU Soil, Water, and Plant Testing Lab can provide all of those parameters for $31.00. The address is A319, NESB, 200 W. Lake St, Fort Collins, CO 80523. The phone number is 970-491-5061. Check out the website at www.soiltestinglab.colostate.edu .